Press for operating on metal sheets or for like purposes



2 1927. 1,615,623 Jan H. A. GRIFFITHS ET AL PRESS FOR OPERATING 0N METAL SHEETS OR FOR LIKE PURPOSES 2 Sheets-Sheet 1 Filed Oct. 17, 1925 H. /7. Griffiths R .H. Griffiths INVENTORS flzfys 2 1927. 1,615,623 Jan H.-A. GRIFFITHS ET AL PRESS FOR OPERATING 0N METAL SHEETS OR FOR LIKE PURPOSES Filed 001;. 17, 1925 2 Sheets-Sheet 2 H. H Griffiths RH. Griffiths IIVVE/VTOR Patented Jan. 25, 1927.

UNITED STATES PATENT OFFIGE.

HARRY ALBERT GRIFFITHS, 0F BIRMINGHAM, AND RICHARD HANSON GRIFFITHS, Q! SUTTON COLDFIELD, ENGLAND.

I PRESS FOB OPERATING ON METAL SHEETS OR FOR LIKE PURPOSES.

Application filed October 17, 1925, Serial No. 83,066, and in Great Britain November 19, 1924.

This invention relates to presses for operating on metal sheets and for like purposes. Ordinarily it is necessary to provi e in the main frame of such machines a deep gap or throat between the upper and lower too s to accommodate the sheets on which the tools operate. The ap extends from the rear of the toolsin the plane of the sheet. To counteract the springiness which would otherwise be present in the main frame, due to the size of the gap, it is usually. necessary tomake the main frame very massive. Machines as ordinarily constructed are therefore cumbersome, unduly heavy, and correspondin 1y costly.

The object of the present invention is to avoid the ordinary liability to springiness in the frame in a manner which affords all the required accommodation for the sheet to be passed between the tools, and at the same time enables the dimensions and mass of the frame to be greatly reduced.

The invention comprises the provision in the frame, of a gap which extends downwardly from the region of the tools (preferably at right angles to plane of the unworked sheet), and means for deflecting into the gap the worked portion of the sheet which has passed between the tools.

The invention also comprises the provision at the upper end of the gap, of a chute for receiving portions cut from the sheet by the tools and delivering them to the rear or other part of the machine.

In the three accompanying sheets of explanatory drawings Figure 1 is a side elevation of a press constructed in accordance with this invention.

Figure 2 is a front elevation of the machine, and Figure 3 a sectional plan on 1, 2, Figure 2.

In the construction of a press as illustrated, for cutting out from thin metal sheets such blanks as are required in the manufacture of circular metal boxes, the tools are preferably arranged with their axis inclined to the vertical, so that the normal plane of the sheet a to be acted on is inclined downwardly to the horizontal. Immediately behind the part carrying the lower or fixed tools b the main frame is formed with a deep gap 0 which extends below the working position of the sheet in a direction at right angles to the plane of the s eet.

The main frame consists of a casting comprising principally two upri ht cheeks (7 which are joined and stiffened by suitable transverse portions as well as by the pertions which carry the upper and lower tools.

and is actuated by a lever g, link h, and lever 2" from a cam j, this mechanism serving to lower the chute into contact with the sheet and to raise it slightly clear of the sheet at appropriate intervals in each cycle of operations.

In combination with the upper tool 9 car ried on the slide is is preferably arranged an ejecting lever Z adapted to detach the work pieces which may adhere to the upper tool during its upward movement. This lever is connected by a link on to a lever n which is actuated by a earn 0. The lever Z acts on an ejecting plunger 8 located within the tool 9.

Also the slide k is preferably fitted with a supplementary deflector r which during the latter part of each downward stroke of the slide resses the adjacent portion of the sheet into the gap 0.

Behind the lower tool a renewable anc preferably adjustable guiding edge piece 12 may be provided for guiding the deflected portion of the sheet.

By this invention we are able to provide the necessary stiffness in the frame in a mannot which results in important reductions in the size and weight of the frame, and in addition to corresponding savlngs in cost we are able to secure advantages ,as regards both design and convenience in use Having thus described our invention what we claim as new and desire to secure by Letters Patent is 1. In a ress for operating on meal sheets and the like, in combination, a reciprocating tool, aframe provided with a gap, said gap being angularly disposed with respect to the working plane of said tool, and means sepivoted to said frame, and means operable 10 plane of 't e tool.

cured to said tool for bending the worked upon movement of the tool away from the portion of the sheet which has passed said sheet for moving said chute into contact with tool and deflecting the sheet into said gap. said sheet to scrape formed articles from the 5 2. In a press as claimed in claim l, an sheet. v

auxiliary deflector secured to said frame In testimony whereof we have signed our 15 at the an 1e of the gap and the working names to this specification.

s v H. A. GRIFFITHS. 3'. In a press as claimed in claim 1, a chute R. H. GRIFFITHS. 

